Kind of unknown information, but comparing pre 1985 Airheads with Ď85-on Airheads is a bit like comparing apples and oranges.

The later bikes have a different frame, and oil filter removal clearance is significantly improved.

The later bikes also have an internal filter canister with a folded over end ... which means you donít need the metal shim to protect the white O-ring.

Experience with older bikes can be irrelevant.